摘要
应用离心泵数值模拟中常用的5种湍流模型,使用Fluent软件对5台不同比转数的离心泵在设计工况下的内部流动进行了叶轮蜗壳耦合数值计算。基于数值模拟结果,对这5种湍流模型进行了对比性研究。研究表明:在设计工况下,5种湍流模型的计算结果与试验值都存在不同程度上的误差;在低比转数离心泵和中等比转数离心泵中,RNGk-ε模型的计算结果与试验值较为接近,而对于高等比转数离心泵,SSTk-ω模型的计算结果相对于其他模型来说较为理想;5种湍流模型所计算出的中间截面处的涡量大小和湍流强度分布都比较相似,但也存在不同程度上的区别,其中RNGk-ε模型相对于其他模型来说差异最为明显。
Five turbulent models,which are commonly used in the numerical simulation of the centrifugal pumps,are introduced in detail.By using commercial code Fluent,the five turbulent models are used to simulate the internal flow at the design point of five centrifugal pumps whose specific speed（ns） are 45.9,84.49,117.8,142.7and 260.5 respectively.According to the simulation results,the head and the efficiency of the pumps are calculated.The calculation results are compared with the experimental data.The comparison shows that all the calculation results of the numerical simulation are more or less different from the experimental data under the design conditions.For simulation of low and medium specific speed centrifugal pumps,the RNG k-ε model is more closer to the experimental value.While for the high specific speed centrifugal pump,the SST k-ω model is more ideal than others.The vorticity magnitude and turbulent intensity,which are calculated by five turbulent models,are similar to each other in general,but there are still some differences.Compared to the other models,the difference between the vorticity magnitude and turbulence intensity obtained by RNG k-ε model is more obvious.
出处
《中国农村水利水电》
北大核心
2011年第2期142-145,共4页
China Rural Water and Hydropower
基金
江苏省"六大人才高峰"项目
江苏省"333工程"项目
关键词
湍流模型
离心泵
数值模拟
比转数
turbulent model
centrifugal pump
numerical simulation
specific speed
